changed the loading message and added a component and its style

src/constants/Loader.css

@@ -0,0 +1,54 @@
+.loader {
+    width: 48px;
+    height: 48px;
+    border-radius: 50%;
+    display: inline-block;
+    position: relative;
+    border: 3px solid;
+    border-color: #FFF #FFF transparent transparent;
+    box-sizing: border-box;
+    animation: rotation 1s linear infinite;
+  }
+  .loader::after,
+  .loader::before {
+    content: '';  
+    box-sizing: border-box;
+    position: absolute;
+    left: 0;
+    right: 0;
+    top: 0;
+    bottom: 0;
+    margin: auto;
+    border: 3px solid;
+    border-color: transparent transparent #FF3D00 #FF3D00;
+    width: 40px;
+    height: 40px;
+    border-radius: 50%;
+    box-sizing: border-box;
+    animation: rotationBack 0.5s linear infinite;
+    transform-origin: center center;
+  }
+  .loader::before {
+    width: 32px;
+    height: 32px;
+    border-color: #FFF #FFF transparent transparent;
+    animation: rotation 1.5s linear infinite;
+  }
+
+  @keyframes rotation {
+    0% {
+      transform: rotate(0deg);
+    }
+    100% {
+      transform: rotate(360deg);
+    }
+  } 
+  @keyframes rotationBack {
+    0% {
+      transform: rotate(0deg);
+    }
+    100% {
+      transform: rotate(-360deg);
+    }
+  }
+

src/constants/Loader.js

@@ -0,0 +1,10 @@
+import React from 'react'
+import './Loader.css'
+
+function Loader() {
+  return (
+    <span class="loader"></span>
+  )
+}
+
+export default Loader

src/constants/messages.js

@@ -15,6 +15,8 @@
  with this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
+import React from 'react'
+import Loader from "./Loader";
 
 const messages = {
   forbiddenResource: "Requested resource is forbidden",
@@ -26,7 +28,7 @@ const messages = {
   groupCreate: "Successfully created the group",
   deletedUser: "Successfully deleted the user",
   confirmDeletion: "Deletion not confirmed",
-  loading: "Loading...",
+  loading: `${<Loader />}`,
   jobsAdded: "Your jobs have been added to job queue",
   createdFolder: "Successfully created the folder",
   deletedFolder: "Successfully deleted the folder",